A water basin, also known as a drainage basin or watershed, is an area of land where all the water that falls as precipitation drains into a common outlet, such as a river, lake, or ocean. This area collects rainwater and snowmelt, channeling it through streams and rivers, which eventually lead to larger bodies of water. Water basins play a crucial role in the water cycle, helping to manage water resources and support ecosystems. They can vary in size, from small local basins to large regional ones, and are essential for activities like agriculture, drinking water supply, and flood management.